Rotary drying-drum.



K. H. G. A. GERLACH.

ROTARY DRYING DRUM.

APPLICATION FILED AUG.7,1913.

1,1 05,41 7, Patented July 28, 1914.

In: NORRIS PFIERS LTL. PHOIO-LITMO WASHINGION o. c.

KARL HEINRICH GOT'ILIEB ALBERT GERLACH, 0F NORDHAUSEN, GERMANY.

ROTARY DRYING-DRUM.

isomer 7.

Specification of Letters Patent.

Application filed August 7, 1913.

Patented July 28, 1914:. Serial No. 783,490.

To all whom it may concern.

lie it known that l, Kant. Hammett Go'rr- Linn Annen'r Gammon, a citizen of the (lee man lhnpire, residing at Nordhausen, in the Kingdom of Prussia, Gern'iany, have invented certain now and useful Improve ments in llotary Drying-Drums, of which the tollowing is a Specification.

lily invention relates to rotary drying drums and refers moreparticularly to the construction and arrangement of the means for subdividing the interior of the drum into longitudinal compartments and of the vanes used in connection therewith; the object being to produce a rotary drying drum allowing oi a more thorough mixing or shutlliug ot' the particles of the material to be dried in order to bring such particles in intimate contact with the hot air passing through the said rotary drying drum; and with this end in view my invention consists in certain novel features of construction and combinations of parts as Will be hereafter fully described and pointed out in the claims: with reference to the annexed drawing in which l igure 1 is a lateral elevation of a drying plant having a rotary drying drum constructed in accordance with and embodying my invention; Fig. 2 is a cross-section of the improved drum on the line l-II Fig. 3, drawn on a somewhat larger scale; Fig. 3 is a longitudinal vertical. section of a part of the drum on the line III-IV Fig. 2.

Similar letters refer to similar parts throughout the several views.

in the interim oi the rotary drying drum (6 there is provided a plurality of longitudinal passages or compartn'ients A partitioned oil? by radially arranged plates 7) supported in the center of the drum by a number of tubular rings 6 inserted between the inner edges of the said plates. The several plates Z) (Fig. 3i forming a partition wall proper do not abut with their end faces against one another but are some distance apart, so as to leave gaps (7 in the said partition wall. To hold the plates 6 in their proper radial positions between the inner supporting rings 6 and the drum proper, there are attached to the inner wall of the drum as well as to the outer Wall of the said rings, at the proper places, suitable holding and guiding means. These latter may consist for example, of angle irons 0 and (Z respectively embracing the said plates in pairs.

The drying drum thus formed shows in cross-section a star'shaped or spidorlilce structure supported in itself by its constituent parts, as is evident from Fig. 2.

As the plates 7) fit loosely or with some play into or between their guiding means c and (Z, the said plates 7) and their supporting rings 0 may be readily and easily removed from or inserted into the drum (1., as required or desired.

To each of the sides of the plates 7) is attached at about right angles a set oi. mixingvaues or wings. the vanes or wings of one set being straight, the vanes 01- wings of the other set having their free edges slightly bent toward the center of the drum. The arrangement is thus that a set of straight vanes f is always opposite to a set of angular vanes g, the vanes of these opposite sets alternating with one another (Fig. 2).

The drum or is rotatably mounted on suitable supporting rollers h (Fig. 1) and may be rotated from a driving shaft 2' by means of a driving belt It: or the like, as this is well known in the art.

The material to be dried is supplied into the drum through a hopper m. The drying medium, 'lor example hot air, is produced in an oven n and drawn lengthwise through the drum by a] tan 0 or any other suitable apparatus to which motion may be imparted from the driving shaft by a driving belt 72 or the like.

The improved construction affords the following advantages: Should any of the partition plates 1) or supporting rings (2 become defective or inoperative it may be easily and readily removed for repairs or change. The opposite alternating straight and angular vanes or wings f and g respectively improve the mixing of the material to be dried. The gaps between the plates 7) of which each partition Wall is composed,

allow the material to be dried to pass during the rotation of the drying drum from one compartment A into the other in a more or less thin layer or veil and in a plane about at right angles to the axis of the drum. The hot air drawn through the drum, passes also through these veils of material, thereby heating the said material in an etlicient man ner. By using short tubes or rings (2 as supports for the plates 1) of the partition walls I attain a practically unobstructed longitudinal central zone or portion increasing the cross sectional heating area of the drum and adapted to allow of, during the rotation of the drum, the falling and tumbling over of the material to be dried from one compartment A into the other, that is to say, from the upper compartments into the lower ones. By this falling or tumbling over and over again of the material through the central portion of the drum the said material is thoroughly mixed and brought into a very intimate contact with the hot air current.

I claim:

1. In a rotary drying drum the com bination of a plurality of longitudinal radial partition plates, central rings arranged some distance apart from one another and adapted to form a central support for said radial partition plates, and means engaging the outer periphery of the rings and the inner periphery of the drum for holding the radial partition plates removably in position, substantially as set forth.

2. In a rotary drying drum the combination of a plurality of longitudinal radial partition plates, each composed of a series of separate plates separated by a gap, central rings arranged some distance apart and adapted to form a central support of the said separate plates, and means for holding the separate plates in proper position, substantially as set forth.

3. In a rotary drying drum the combination of a plurality of longitudinal radial partition plates provided on each side with a set of tangential mixing vanes, central rings arranged some distance apart and adapted to form an open central support for the radial partition plates, and means to hold the radial partition plates in position, substantially as set forth.

4. In a rotary drying drum the combination of a plurality of longitudinal removable radial partition plates, central removable supporting vrings, and means provided on said rings and on the drum for guiding and holding the removable radial plates in their proper radial position, substantially as set forth.

5. In a rotary drying drum the combination with the drum proper of a plurality of longitudinal partition plates each composed of a series of removable separate plates, of vanes or wings on each side thereof, the set of vanes on one side being straight while the set of vanes on the other side are bent, of central removable supporting rings, and of means for guiding and holding the said removable separate plates and the central removable rings in their proper relative positions, substantially as set forth.

6. In a rotary drying drum the combination with the drum proper of a plurality of longitudinal removable artition plates con posed each of a number of separate plates arranged some distance apart to form a gap between two adjacent separate plates, of central removable supporting rings, and of means for guiding and holding the partition plates and central supporting rings in their proper relative positions, substantially as set forth.

7. In a rotary drying drum the combination with the drum proper of a plurality of longitudinal partition plates each composed of a series of removable separate plates, arranged some distance apart to leave gaps between them, of vanes or wings provided on each side of the said separate plates, the vanes of one side being straight and the vanes of the other side being bent, both sets of vanes alternating with each other, of central removable supporting rings arranged some distance apart, and of means for guiding and holding the separate plates and supporting rings in their proper relative po srtions, substantially as set forth.

8. A rotary drying drum having radially arranged partition plates subdividing the interior of the drum into longitudinal passages characterized by the fact that the longitudinal partition plates are composed each of a series of removable separate plates leaving gaps between their adjacent ends and being supported by central separate rings so that the central or mlddle portion of the drum is unobstructed for the passage of the material to be dried and the hot air, sub stantially as set forth.

KARL HEINRICH GOTTLIEB ALBERT GERLAOH.

W'itnesses VVQLDEMAR HAUPT, HENRY HASPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

